Question

Two trains are approaching each other on adjacent tracks each running with a constant velocity of 10 m/s. When they are at a distance of 90 m, a bird flying right with one of the train engines decides to go ahead towards the other train with double the speed of the train. As soon as it reaches the other train, it turns around without landing and flies back to the train it started from. How many times can the bird go from train to train before the trains meet assuming that it needs 0.3 s to reverse its direction of flight. How many times can the bird go if it were able to reverse its velocity instantaneously? Show the details of your calculation.

Answer 1